There was another problemwith the diacritics. In the off-line editor I can't see most of the content of one of the files, in which I manually corrected most of the diacritics. At the same time, in the MATLA Online service the entire content of the file is available. When I corecetd a few left diacritics, saved and downloaded the file, I do not see the full content again. See the screen shots below (please note the scroll bar on the right).
Broken file off-line
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Broken file on-line
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Broken file after download from the MATLAB Online
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